From Amazon
edding 300 Permanent Marker - Blue - 1 Pen - Round Tip 1.5-3 mm - Waterproof, Quick-Drying, Smear-Proof Pens - for Cardboard, Plastic, Glass, Wood, Metal and Fabric
Conrad Electronic
Edding edding 300 4-300003 Permanent marker Dark blue waterproof: Yes
cccraft
Edding 300 Marker, line 1,5-3 mm, blue, 1 pc